I suspect it is because of the recent marketing update. Your reputation has probably taken a 50% drop, so loadfactor is going down. I think is a slight unrealistic side effect of the new marketing feature , but since Unk is so kind as to make marketing free for now, just put all your money into the marketing campaigns for now

In overall the load factors for most of the routes(excluding departures between 1am-4am) have come down by 2-5%. And wee hour departures is the one which took big hit. Especially Y & Y+ is zero for many of them.

This happened exactly after the airline image went down by 50% and when the route scheduler ran the next morning.

So i suspect something related to this is dragging down. I am not sure what other players are experiencing.